【Java】Java根据出生日期计算还有几天的生日

╰半夏微凉° 2022-06-18 07:08 412阅读 0赞

实例：

SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
            String clidate = "1978-03-30";
            Calendar cToday = Calendar.getInstance(); // 存今天
            Calendar cBirth = Calendar.getInstance(); // 存生日
            cBirth.setTime(myFormatter.parse(clidate)); // 设置生日
            cBirth.set(Calendar.YEAR, cToday.get(Calendar.YEAR)); // 修改为本年
            int days; 
            if (cBirth.get(Calendar.DAY_OF_YEAR) < cToday.get(Calendar.DAY_OF_YEAR)) {
                // 生日已经过了，要算明年的了
                days = cToday.getActualMaximum(Calendar.DAY_OF_YEAR) - cToday.get(Calendar.DAY_OF_YEAR);
                days += cBirth.get(Calendar.DAY_OF_YEAR);
            } else {
                // 生日还没过
                days = cBirth.get(Calendar.DAY_OF_YEAR) - cToday.get(Calendar.DAY_OF_YEAR);
            }
            // 输出结果
            if (days == 0) {
                System.out.println("今天生日");
            } else {
                System.out.println("距离生日还有：" + days + "天");
            }

场景：

@RequestMapping(value="/toPerBirthday.do")
    	public @ResponseBody List<Map<String, Object>> getIndexPerBasicInfo(HttpServletRequest request,
    			HttpServletResponse response,ModelMap model) throws Exception{
    		SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
    		//查询人员生日信息
    		List<PerBasicInfo> pBasicInfos = personBasicInfoService.findPerBirthdayDay();
    		List<Map<String, Object>> brithdayList = new ArrayList<Map<String, Object>>();
    		
    		for(PerBasicInfo pb : pBasicInfos){
    			Map<String, Object> perBaiscMap = new HashMap<String, Object>();
    			String birthdayStr = myFormatter.format(pb.getBirthday());
    			
    			Calendar cToday = Calendar.getInstance(); // 存今天
    	        Calendar cBirth = Calendar.getInstance(); // 存生日
    	        cBirth.setTime(myFormatter.parse(birthdayStr)); // 设置生日
    	        cBirth.set(Calendar.YEAR, cToday.get(Calendar.YEAR)); // 修改为本年
    	        int days; 
    	        if (cBirth.get(Calendar.DAY_OF_YEAR) < cToday.get(Calendar.DAY_OF_YEAR)) {
    	            // 生日已经过了，要算明年的了
    	            days = cToday.getActualMaximum(Calendar.DAY_OF_YEAR) - cToday.get(Calendar.DAY_OF_YEAR);
    	            days += cBirth.get(Calendar.DAY_OF_YEAR);
    	        } else {
    	            // 生日还没过
    	            days = cBirth.get(Calendar.DAY_OF_YEAR) - cToday.get(Calendar.DAY_OF_YEAR);
    	        }
    	        
    	        perBaiscMap.put("name", pb.getName());
    	        perBaiscMap.put("birthday", birthdayStr);
    	        perBaiscMap.put("time", birthdayStr.substring(5, 7).concat(".").concat(birthdayStr.substring(8, 10)));
    	        perBaiscMap.put("type", "0");
    	        if (days == BasicConstants.DAY_ZERO) {
    	        	perBaiscMap.put("type", "1");
    				perBaiscMap.put("msg",BasicConstants.TODAY.concat(pb.getName().replaceAll(",",  "、")).concat(BasicConstants.TEACHER_BRITHDAY));
    	        }else if (days == BasicConstants.DAY_ONE) {
    	        	perBaiscMap.put("type", "1");
    	        	perBaiscMap.put("msg", BasicConstants.TOMORROW.concat(pb.getName().replaceAll(",", "、")).concat(BasicConstants.TEACHER_BRITHDAY));
    	        }else if (days == BasicConstants.DAY_TWO) {
    	        	perBaiscMap.put("type", "1");
    	        	perBaiscMap.put("msg", BasicConstants.AFTER_TOMORROW.concat(pb.getName().replaceAll(",", "、")).concat(BasicConstants.TEACHER_BRITHDAY));
    	        }
    	        if(Integer.parseInt((String)perBaiscMap.get("type")) == 1){
    	        	brithdayList.add(perBaiscMap);
    	        }
    		}
    		return brithdayList;
    	}

效果：

![20170331134155925][]

[20170331134155925]: /images/20220618/c59561f1e3bf4a95a304a0ac805505af.png